Having only played the beta I'll only comment on the multiplayer.
This is almost a direct translation of COD4 into the WW2 era. You've got familiar perks and kill streak bonuses WW2 style, including vehicle perks! Worthy of note are the dogs at a 7 kill streak, they really put the fear into the enemy and are more balanced than the helicopter from COD4.
Vehicles make a comeback but so far I've only seen the tanks, with the introduction of the sticky grenade and the ability of having bazookas in a similar fashion to RPG's in COD4 they aren't too much of a hindrance against a canny (and well equipped) enemy, if well supported however they are death machines!
The graphics and game play are very similar to that of COD4, however some of the game effects like shellshock, gas grenades and watching people get dismembered add much to its evolution!
Online play (note: Beta online play) still uses the COD4 match making lobby which is quite terrible! Please just copy the Halo3 lobby and use a true skill matchmaking system!
All in all it would appear to be a good game, but with so many other good titles coming out in the same period if you already have COD4 it might be worth getting Gears 2 instead (or after).